Mechanical shaft seals offer design versatility
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Flowserve product story
Edited by the Engineeringtalk editorial team
Jul 3, 2001
The ISC (innovative standard cartridge) series of mechanical shaft seals available from Flowserve are designed for general purpose applications on ANSI and DIN process pumps.
The ISC (innovative standard cartridge) series of mechanical shaft seals available from Flowserve are designed for general purpose applications on ANSI and DIN process pumps.
Within common gland and sleeve platforms, which cover either standard or enlarged bore configurations, interchangeable pusher and metal bellows sealing arrangements can be accommodated for both single and dual seal products.
An optional elastomer bellows assembly is also available in the single seal variation.
This design versatility combines operating economy with performance reliability, to help meet and even exceed a wide range of general process pump applications and environmental requirements.
Typical industries include chemical processing, pulp and paper, oil refineries, water and wastewater, together with many general industrial applications including food and beverage production.
The seal glands feature a universal slot fixing compatible with most pumps, and also accommodate a range of bolt circle diameters.
In standard form, mating rings are manufactured from sintered silicon carbide and primary rings from premium resin grade carbon.
These have robust face cross-sections for increased reliability, with homogeneous structures for stable performance in the pusher seal configuration.
The silicon carbide rings are held in compression and fully protected to ensure reliable equipment start-up.
Dual seal designs incorporate a unique pumping feature which results in cooler operation and enhanced MTBF times.
They are also double balanced to provide both pressurised and non-pressurised dual seal options for increased equipment dependability.
The 316 stainless steel and C-276 alloy materials used for construction provide high chemical compatibility guaranteeing longer seal life.
Springs are isolated from the process fluids to reduce stress corrosion.
Alternative metal part specifications, primary ring materials and elastomers can also be accommodated for specialised applications.
A wide range of shaft sizes are covered in the ISC range, including from 33 to 65mm diameter metric sizes and 1.125" to 2.750" in the imperial variations.
Maximum operating pressures vary with seal designs from 10 bar (150psig) for the elastomer bellows unit, to 14 bar (200psig) for the metal bellows version and 20 bar (300psig) for the pusher seal design.
The working temperature range is -18ø to +204øC (0ø - 400øF), at maximum speeds of 23m/s (4500 fpm) on dynamic installations and 30m/s (6000 fpm) on stationary designs.
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